Answer:
Question	Answer
Inquiry	This is the act of trying to find the answer to an unknown question by the use of experimentation and research.
Investigation	This is the process of researching or studying a concept. Examination, inquiry
Explanation:
 
        
             
        
        
        
Carbon skeletons may vary in length, shape, number and location of double bonds and other elements covalently bonded to available sites. 
A carbon atom contains four valence electrons thus, exhibiting a strong tendency to make covalent bonds with other atoms so as to complete its octet. Covalent bonds join carbon atoms together in long chains that create the skeletal framework for organic molecules.
A carbon atom could be linked to as many as four additional carbon atoms in an organic compound. Carbon atoms can also quickly form double bonds (where four electrons are shared among two atoms) and triple bonds (where six electrons are shared).
This variation in carbon skeletons contributes to the diversity and complexity of organic molecules.
To learn more about covalent bonds here
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i think c. is the best answer , we just got off that topic like a week ago .
 
        
             
        
        
        
Answer:
The correct answer is option D, that is, the elephant will not react. 
Explanation:
A kind of behavior that comprises a stimulus-response, which is distinct from the natural one is termed as conditioning. It is a kind of learned behavior. It is a kind of learning where the efficacy of stimulus enhances while provoking a response. When the presentation of two stimuli is done at a suitable time and with appropriate intensity, then one of them will be able to provoke a response that resembles the other one.  
In the given case, the mouse and the trombone are termed as unconditioned and conditioned stimuli. When a conditioned stimulus is demonstrated in a context of classical conditioning, it will result in the non-predication of the coming unconditioned stimulus. The conditioned response will get to cease slowly and will eliminate the conditioned fear. Thus, in the given case, the elephant will fail to react towards the trombone subsequently.